SITE INFORMATION AND CORRESPONDENCE

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STATE OF CALIFORNIA- Environmental Prot, n Agency PETE WILSON, Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION q p/ 3443 Routier Road, Suite A 1-CN1i IRMNENTAL HEALTH Sacramento, CA 95827-3098 .PEWIT SFRVIGF PHONE: (916) 255-3000 FAX: (916) 255-3015 93 JUL -9 PN 2* 29 2 July 1993 Mr. Steve M. Ferrara Santa Fe Pacific Pipeline Partners, L. P. 888 South Figueroa Street Los Angeles, CA 90017 B-ZONE WELL INSTALLATION REPORT, SANTA FE PACIFIC PIPELINE PARTNERS (SFPP), STOCKTON FACILITY, SAN JOAQUIN COUNTY I have reviewed Hart-Crowser's 11 June 1993 report entitled B-Zone Well Installation/Additional Site Assessment and the monitoring report for the fust quarter of 1993 for your facility in Stockton. My comments follow. 1. The rationale for the location of the well was not stated. Based on the recently submitted monitoring report, the highest contaminant concentrations are found in monitoring well (MW) 1. It is likely that the highest contaminant concentrations in the B-zone would be near MW 1. Also, the prover loop area which has been identified as a potential source in a previous investigation is adjacent to MW 1. A deep well may be needed at this location. 2. The well installation report states that the A/B interface zone continued to a depth of 30 feet below ground surface (bgs), the total depth of boring was 45 feet, the screen interval extended from 28 - 43 feet bgs, and the filter pack was placed about one foot above the top of the screen. Why was the screen extended into the A/B interface zone? What is the rationale for the 15-foot screen? The screen length should have been kept to a minimum to permit sampling of ground water at a discrete depth since high yiel is unim1 Cant in this case. Additional wells may have to be placed to get a clear definition of the extent of contamination. 3. All ground water monitoring data should be included in the tables presented in the monitoring report so that changes, trends, and other contaminant characteristics are easily discernible. Total lead was not included in the 1993 first quarter testing. If it was not included in the second quarter testing, it must be included in the next sampling round. 4. Enclosed is a revised proposed monitoring and reporting program (MRP) for your Stockton terminal. The originally proposed program is being revised to require monthly instead of quarterly water level measurements. All other parameters/constituents remain the same.